Answer:
If the cart is pushed with twice the net force while its mass increases by four, its acceleration would be half the other acceleration.
Explanation:
Newton's second law relates the force (F) applied to an object with its acceleration (a) in the next way:
(1), with m the mass of the object (the cart in our case)
Note that the acceleration is directly proportional to the force applied and inversely proportional to the mass of the object, that means if we let m constant and increase the force the acceleration will increase too, and if we let F constant and increase m the acceleration will decrease, but if we increase the two quantities at the same time, we should analyze mathematically the situation to observe better the behavior of the acceleration. If 
and 
the acceleration by Newton’s second law is now:
Note that 
so the acceleration would be half the initial acceleration
What does this supposed to mean?
Explanation:
kinetic energy is energy that it possesses due to its motion.
The scientist who suggested that atoms contain a hard core containing most of the mass of an atom was Ernest Rutherford.
Answer:
The flashlight leaves the water at an angle of 51.77°.
Explanation:
if n1 = 1.33 is the refractive index of water and ∅1 is the angle at which the flashlight shine beneath the water, and n2 = 1.0 is the refractive index of air and ∅2 is the angle the flashlight leaves the water.
Then, according to Snell's law :
n1×sin(∅1) = n2×sin(∅2)
sin(∅2) = n1×sin(∅1)/n2
= (1.33)×sin(36.2)/(1.0)
= 0.7855055×379
∅2 = 51.77°
Therefore, the flashlight leaves the water at an angle of 51.77°.
